The book Central Banking 101, by Joseph Wang, is a good deep-dive on how the accounting works on the central-banking side when money is created, etc.

> Any other deep-dive guides on fintech/payments that would be helpful for readers here?

How online payments actually work behind the scenes, complete flow from sender to receiver. That deep-dive would be really useful.

Do you mean for card payments, like the card network and authorization flow? I found this article really good from the systems design side although you might have to be a subscriber: https://newsletter.pragmaticengineer.com/p/payments-system

> Do you mean for card payments, like the card network and authorization flow?

Yes.